CN107681681A - A kind of system-level control method of the MTDC transmission system based on VSC - Google Patents
A kind of system-level control method of the MTDC transmission system based on VSC Download PDFInfo
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- CN107681681A CN107681681A CN201710980607.4A CN201710980607A CN107681681A CN 107681681 A CN107681681 A CN 107681681A CN 201710980607 A CN201710980607 A CN 201710980607A CN 107681681 A CN107681681 A CN 107681681A
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- current conversion
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- 230000008859 change Effects 0.000 description 12
- 238000011217 control strategy Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of system-level control method of the MTDC transmission system based on VSC, comprise the following steps：Obtain the reference voltage U of current conversion station in MTDC transmission systemrefAnd reference power Pref, further according to the reference voltage U of current conversion station in MTDC transmission systemrefAnd reference power PrefCalculate the dc power P of current conversion station in MTDC transmission systemd, then according to the dc power P of current conversion station in MTDC transmission systemdThe system-level of MTDC transmission system is controlled, completes the system-level control of the MTDC transmission system based on VSC, wherein, the dc power P of current conversion station in MTDC transmission systemdFor：Pd=K (Ud‑Uref)3+Pref, wherein, K be MTDC transmission system in current conversion station control coefrficient, UdFor the DC voltage of current conversion station in MTDC transmission system, this method can maintain system voltage stable when current conversion station power variation is larger, avoid system dc voltage out-of-limit.
Description
Technical field
The invention belongs to field of power system control, is related to a kind of system-level control of the MTDC transmission system based on VSC
Method.
Background technology
The development of social economy proposes new requirement to transmission system, and existing UHV AC transmission technique is defeated in Large Copacity
There is inferior position for electricity, system stabilization etc..On the other hand, along with the large-scale development of new energy, have high uncertain
Plant-grid connection power network, scheduling to power network, control propose challenge.Therefore in traditional ac transmission and direct current transportation skill
, it is necessary to new technology of transmission of electricity outside art.
By development for many years, flexible DC power transmission supplies in the asynchronous interconnection of AC network, wind farm grid-connected, offshore platform
The fields such as electricity, the power supply of city load center have been obtained for being widely applied.Technology of HVDC based Voltage Source Converter is being inherited based on electricity
Outside the Traditional DC technology of transmission of electricity of stream source transverter is relative to the advantage of ac transmission, also there is 1) control flexible；2) do not have
Commutation failure problem；3) harmonic content is small；4) more flexible etc. advantage of network topology structure.Technology of HVDC based Voltage Source Converter is easier
Form multiterminal.
The problem of multiterminal flexible direct current system (VSC-MTDC) is related to multiple current conversion stations, and it is controlled, operation etc. is with two
Power Exchange be present between the corresponding AC system of different current conversion stations, change in the DC transmission system at end compared to more complicated
There is electrical couplings between electrical quantity between stream station, the matching problem between the current conversion station thus brought is urgently to be resolved hurrily.To the greatest extent
The shortcomings that cost is high, current conversion station loss is big be present in pipe VSC-MTDC, but as the progress of science and technology will make moderate progress.
Existing Multi-end flexible direct current transmission system level control method mainly has three kinds：Master ＆ slave control, voltage margin control
And droop control.
1) master ＆ slave control：The core of master ＆ slave control passes through one main change of current for determining voltage of setting in multi-terminal system
Stand to control the voltage of whole system, remaining each station is used as slave station, determines power.Broken down or exit for some reason fortune in main current conversion station
During row, main current conversion station is switched to from current conversion station, DC voltage control is carried out instead of original main current conversion station.
2) voltage margin controls：Voltage margin is controlled compared with master ＆ slave control, and what setting one was standby more determines voltage master control
Stand, master station remains set to determine voltage control, and voltage instruction value and the master control voltage instruction value of standing firm of determining of standby station have necessarily
Nargin.In master station because when failure is out of service, standby station can automatically switch to master station.
3) voltage droop control：Voltage droop control strategy has used for reference the frequency droop control of AC system, with the change of current
The increase for dc power of standing, current conversion station DC voltage decline therewith.Multiple current conversion stations can be arranged in systems under voltage
Hang down and control, common regulating system voltage.When there is a station because of failure removal, droop control strategy enables to current conversion station automatically will
The DC voltage of system is adjusted to poised state with power, and this process does not need the communication between current conversion station, and reliability is higher.
Simultaneously as voltage-the power curve provided is continuous, the stepped change controlled relative to master ＆ slave control and voltage margin,
The impact that system is subject to is smaller.
It is proportional to voltage variety for the current conversion station of applied voltage droop control, its power variation.Work as current conversion station
When power variation is larger, the linear change of current conversion station voltage also can be very big, and then causes system voltage significantly change, and may
Cause voltage out-of-limit.To alleviate this problem, it is necessary to set droop control slope of a curve smaller.And this can cause work(
Rate changes the decrease of hour current conversion station regulating power.When power variation is smaller, the adjustable range in current conversion station control strategy
Within the voltage that is unlikely to cause current conversion station or power more prescribe a time limit, voltage droop control can be automatically according to the change of system power
The regulation for carrying out voltage reaches balance and maintains system voltage stable, and this point has excellent relative to nargin control with master ＆ slave control
Gesture.
The content of the invention
A kind of the shortcomings that it is an object of the invention to overcome above-mentioned prior art, there is provided multiterminal element system based on VSC
System system-level control method, this method can be maintained when current conversion station power variation is larger system voltage stably, avoid be
DC voltage of uniting is out-of-limit.
To reach above-mentioned purpose, the system-level control method of the MTDC transmission system of the present invention based on VSC includes
Following steps：
According to the reference electricity of current conversion station in given system operation mode and current conversion station procurement of reserve capacity MTDC transmission system
Press UrefAnd reference power Pref, the COEFFICIENT K of current conversion station in MTDC transmission system is calculated, obtains current conversion station DC voltage UdWith direct current work(
Rate PdFunctional relation, complete the system-level control of the MTDC transmission system based on VSC, wherein, the change of current in MTDC transmission system
The dc power P to standdFor：
Pd=K (Ud-Uref)3+Pref。
According to the reference voltage U of current conversion station in MTDC transmission systemrefWith reference power PrefAnd the voltage of system operation
Constraint and power constraint calculate the COEFFICIENT K of current conversion station in MTDC transmission system.
The invention has the advantages that：
The system-level control method of MTDC transmission system of the present invention based on VSC is in concrete operations, by more
The control coefrficient K of current conversion station make it that DC voltage and dc power are according to transmission system under normal operating condition in the straight-flow system of end
Service requirement and the rated power of current conversion station determine.Simultaneously because the change of DC voltage turn to it is nonlinear, when direct current work(
When the offset of rate and reference point is larger, voltage there will not be larger change, so as to reach current conversion station power variation compared with
System voltage stable purpose is maintained when big, the problem of avoiding system dc voltage out-of-limit.
Brief description of the drawings
Fig. 1 is the control strategy graph of equation of the present invention；
Fig. 2 is the network topological diagram of embodiment one in the present invention；
Fig. 3 is the power of current conversion station 2 and current conversion station 3 under droop control；
Fig. 4 is the power of current conversion station 1 and current conversion station 4 under droop control；
Fig. 5 is the voltage curve of each current conversion station under droop control；
Fig. 6 is the power of current conversion station 2 and current conversion station 3 under improvement control strategy；
Fig. 7 is the power of current conversion station 1 and current conversion station 4 under improvement control strategy；
Fig. 8 is the voltage curve for improving each current conversion station under control strategy.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
With reference to figure 1, the system-level control method of the MTDC transmission system of the present invention based on VSC includes following step
Suddenly：
According to the reference electricity of current conversion station in given system operation mode and current conversion station procurement of reserve capacity MTDC transmission system
Press UrefAnd reference power Pref, the COEFFICIENT K of current conversion station in MTDC transmission system is calculated, obtains current conversion station DC voltage UdWith direct current work(
Rate PdFunctional relation, complete the system-level control of the MTDC transmission system based on VSC, wherein, the change of current in MTDC transmission system
The dc power P to standdFor：
Pd=K (Ud-Uref)3+Pref。
Wherein, according to the reference voltage U of current conversion station in MTDC transmission systemrefWith reference power PrefAnd system operation
Voltage constrains and power constraint calculates the COEFFICIENT K of current conversion station in MTDC transmission system.
Embodiment one
Fig. 2 is the topology of four sections of systems, and systematic parameter is as shown in table 1, table 2 and table 3：
Table 1
Table 2
Table 3
As a result prove, the present invention has the ability of burning voltage.
The Transient simulation results carried out in pscad also illustrate that the effect for changing control strategy for burning voltage, power.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, protection model of the invention
Enclose and be not limited thereto, any one skilled in the art is the invention discloses in the range of, according to the present invention's
Technical scheme and its inventive concept are subject to equivalent substitution or change, belong to protection scope of the present invention.
Claims (2)
1. a kind of system-level control method of the MTDC transmission system based on VSC, it is characterised in that comprise the following steps：
According to the reference voltage U of current conversion station in given system operation mode and current conversion station procurement of reserve capacity MTDC transmission systemref
And reference power Pref, the COEFFICIENT K of current conversion station in MTDC transmission system is calculated, obtains current conversion station DC voltage UdWith dc power Pd's
Functional relation, the system-level control of the MTDC transmission system based on VSC is completed, wherein, current conversion station is straight in MTDC transmission system
Flow power PdFor：
Pd=K (Ud-Uref)3+Pref。
2. the system-level control method of the MTDC transmission system according to claim 1 based on VSC, it is characterised in that root
According to the reference voltage U of current conversion station in MTDC transmission systemrefWith reference power PrefAnd the voltage constraint of system operation and power
Constraint calculates the COEFFICIENT K of current conversion station in MTDC transmission system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710980607.4A CN107681681B (en) | 2017-10-19 | 2017-10-19 | System-level control method of VSC-based multi-terminal direct current system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710980607.4A CN107681681B (en) | 2017-10-19 | 2017-10-19 | System-level control method of VSC-based multi-terminal direct current system |
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| Publication Number | Publication Date |
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| CN107681681A true CN107681681A (en) | 2018-02-09 |
| CN107681681B CN107681681B (en) | 2020-06-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178539A (en) * | 2013-03-21 | 2013-06-26 | 浙江省电力公司电力科学研究院 | Direct current voltage deviation slope control method for multi-end flexible direct current power transmission system |
| CN103762583A (en) * | 2013-10-21 | 2014-04-30 | Abb技术有限公司 | Tandem type multi-terminal direct-current power transmission system and power control method thereof |
| CN105680465A (en) * | 2016-01-26 | 2016-06-15 | 上海交通大学 | Improved coordination control method for multi-terminal flexible direct current power transmission system |
| CN106356883A (en) * | 2016-10-24 | 2017-01-25 | 南方电网科学研究院有限责任公司 | Multi-terminal flexible direct current transmission control method |
| CN106451515A (en) * | 2016-08-17 | 2017-02-22 | 东北电力大学 | Generalized sagging control method suitable for multi-terminal flexible direct current power transmission system |
-
2017
- 2017-10-19 CN CN201710980607.4A patent/CN107681681B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178539A (en) * | 2013-03-21 | 2013-06-26 | 浙江省电力公司电力科学研究院 | Direct current voltage deviation slope control method for multi-end flexible direct current power transmission system |
| CN103762583A (en) * | 2013-10-21 | 2014-04-30 | Abb技术有限公司 | Tandem type multi-terminal direct-current power transmission system and power control method thereof |
| CN105680465A (en) * | 2016-01-26 | 2016-06-15 | 上海交通大学 | Improved coordination control method for multi-terminal flexible direct current power transmission system |
| CN106451515A (en) * | 2016-08-17 | 2017-02-22 | 东北电力大学 | Generalized sagging control method suitable for multi-terminal flexible direct current power transmission system |
| CN106356883A (en) * | 2016-10-24 | 2017-01-25 | 南方电网科学研究院有限责任公司 | Multi-terminal flexible direct current transmission control method |
Non-Patent Citations (3)
| Title |
|---|
| NING LIANHUI ; XIE CHUNXIAO ; BAI HUIYUAN ; WU DI: "The amelioration of control strategy of VSC-MTDC based on voltage droop control", 《2017 2ND INTERNATIONAL CONFERENCE ON POWER AND RENEWABLE ENERGY (ICPRE)》 * |
| XIAONING KANG; HAO WANG ; XIUDA MA ; QIYUE HUANG ; XUZE ZHANG: "Parameters optimization of DC voltage droop control based on VSC-MTDC", 《2016 IEEE PES ASIA-PACIFIC POWER AND ENERGY ENGINEERING CONFERENCE (APPEEC)》 * |
| 刘瑜超 等；: "基于自适应下垂调节的VSC-MTDC功率协调控制", 《中国电机工程学报》 * |
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